CN104319008A - High-temperature-resistant low-loss compound insulation coaxial cable - Google Patents
High-temperature-resistant low-loss compound insulation coaxial cable Download PDFInfo
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- CN104319008A CN104319008A CN201410593336.3A CN201410593336A CN104319008A CN 104319008 A CN104319008 A CN 104319008A CN 201410593336 A CN201410593336 A CN 201410593336A CN 104319008 A CN104319008 A CN 104319008A
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Abstract
Provided is a high-temperature-resistant low-loss compound insulation coaxial cable. The high-temperature-resistant low-loss compound insulation coaxial cable is characterized in that a solid or stranded inner metal conductor (1), a polytetrafluoroethylene micropore compound insulation layer (2), an outer conductor (3) and a sheath layer (4) are arranged from inside to outside in sequence, the solid or stranded inner metal conductor (1) longitudinally extends along the central axis of the cable, the outer conductor (3) is formed by knitting metal or is additionally provided with an inner shielding layer, the sheath layer (4) is made of FEP copolymer or low-smoke halogen-free flame retardant polyolefin, and the inner metal conductor (1) and the outer conductor (3) are separated by the polytetrafluoroethylene micropore compound insulation layer (2); the polytetrafluoroethylene micropore compound insulation layer (2) is made of modified polytetrafluoroethylene organic-inorganic nanocomposites filled with nano polyhedral oligomeric silsesquioxanes (POSS). According to the coaxial cable, the dielectric constant of the insulation layer of the cable is reduced. A traditional solid polytetrafluoroethylene insulation dielectric constant is reduced to 1.2-1.6 from 2.1 and is reduced by about 24 percent to 43 percent, and the signal attenuation of cable high-frequency communication is reduced.
Description
Technical field
The invention belongs to communications cable product in communication transfer field, specifically there is the one high temperature resistant low-loss compound inslation coaxial cable of the composite microporous insulation system of the filling-modified polytetrafluoroethylene of nano particle POSS.This cable can be widely used in the information transmission of the HF communication equipment had in the industry such as Radar-Communication, machine room, space flight and aviation, mine oil well, antenna, boats and ships of high temperature resistant low-loss requirement.
Background technology
Radio frequency cable is the general name of the cable of transmission of electric signals and energy in radio-frequency band, and wherein coaxial cable applications is the most extensive.Coaxial cable be mainly used as the feeder of radio transmission and receiving equipment and variously to communicate, the machine interior lines line of electronic equipment and be interconnected line.In today of high speed information development, the information transfer demands of high-frequency, Large Copacity, two-forty it is also proposed higher requirement to the information transmission medium telecommunication cable between communication equipment, and high temperature resistant, low-loss, fire-retardant, high shielding properties have become the key technical index of development coaxial cable.The high-end telecommunication cable product of the low decay of exploitation HF communication, low-voltage standing-wave ratio, the steady phase performance of height is a Main way of current research of technique, and in construction of cable influencing factor, the characteristic of insulating material plays vital effect.
Polytetrafluoroethylene has lower dielectric constant (2.1), moisture resistance and corrosion resistance, and stable chemical nature, resistance to elevated temperatures is strong, become the predominating insulation of current high temperature field of telecommunications cables, but its material has the deficiencies such as mechanical strength is low, cementability is poor, coefficient of linear expansion is larger, shaping and suitability for secondary processing is difficult, creep resistance is poor, become and limit its key technology bottleneck in high-end field of cables extensive use.
Summary of the invention
The object of the present invention is to provide a kind of high temperature resistant low-loss compound inslation coaxial cable, the filling-modified method of physical blending is carried out by introducing ultralow dielectric nano porous cage-type silsesquioxane (POSS) in Teflom Insulation Material, reduce the dielectric constant of cable insulation, improve the porosity of cable insulation, improve the deficiencies such as cable insulation mechanical performance, creep resistance, processing difficulties, Simplified flowsheet difficulty, enhance productivity, improving product qualification rate, increases the combination property of cable.By introducing nano-particles filled modification, improve material property, improve processing technology difficulty, microporous insulation structure is formed by pushing stretching sintering process, greatly improve cable electrical performance, for the application of Teflom Insulation Material on high temperature resistant low loss cable provides new thinking, also make the application prospect of product in HF communication more wide.
Technical scheme of the present invention is:
A kind of high temperature resistant low-loss compound inslation coaxial cable, be followed successively by from inside to outside: along the restrictive coating 4 of the solid or stranded metallic inner conductor 1 of the central axis longitudinal extension of cable, polytetrafluoroethylene micropore composite insulation layer 2, outer conductor 3 that is metal knitted or additional internal shield, fluorinated ethylene propylene copolymer or low smoke halogen-free flame-retardant polyolefin material, wherein metallic inner conductor 1 and outer conductor 3 separate by polytetrafluoroethylene micropore composite insulation layer 2; The material of described polytetrafluoroethylene micropore composite insulation layer 2 is the filling-modified polytetrafluoroethylene organic-inorganic nanocomposite of nanometer polyhedral cage-type silsesquioxane POSS.
The material of described polytetrafluoroethylene micropore composite insulation layer 2 is the filling-modified polytetrafluoroethylene organic-inorganic nanocomposite of nanometer polyhedral cage-type silsesquioxane (POSS), in composition, nanometer polyhedral cage-type silsesquioxane (POSS) is polyhedron cagelike structure, the surrounding of its cube of Si-O-Si cagelike structure is connected to 8 organic groups (functional or inertia) in the mode of covalent bond, as hydrogen (hydride), alkyl (alkyl), alkylidene (alkylene), aryl (aryl), arlydene (arylene) and other deriveding groups (other derivative groups), for inorganic-organic hybridization nano particle, have the odd number solution of nano material, and there is good compatibility with organic polymer material.
In the material composition of described polytetrafluoroethylene micropore composite insulation layer 2, the size of nanometer polyhedral cage-type silsesquioxane POSS cage is about 0.53nm, and be a kind of Intrinsical porous media material, in molecular structure, space is about 0.3-0.4nm, dielectric constant is 2.1 ~ 2.7, adjustable.
In the material composition of described polytetrafluoroethylene micropore composite insulation layer 2, before filling-modified, adopt silane coupler or other suitable coupling agents to nanometer polyhedral cage-type silsesquioxane POSS process, coupling agent can strengthen the interaction between two kinds of opposed polarity molecules, serve as a kind of effect of chemical medium, increase the intensity of composite material, improve adhesion between the two, ensure that it mixes with the full and uniform of polytetrafluoroethylmaterial material.
In the material composition of described polytetrafluoroethylene micropore composite insulation layer 2, the ratio of filling-modified nanometer polyhedral cage-type silsesquioxane POSS is 5% ~ 25%, and the content of polytetrafluoroethylene is 75% ~ 90%.
The physical blending of the material of described polytetrafluoroethylene micropore composite insulation layer 2 is combined by two kinds in employing mechanical mixture, air-flow crushing and ultrasonic wave process and above method fully to mix.
Described polytetrafluoroethylene micropore composite insulation layer 2, by pushing stretching mode processing, ensures that insulating barrier has certain uniform pore, forms micropore shape composite construction.
The porosity of the micropore in described polytetrafluoroethylene micropore composite insulation layer 2 is between 50% ~ 80%, and the micropore composite insulation layer dielectric constant realizing nanometer polyhedral cage-type silsesquioxane POSS filling-modified is 1.2 ~ 1.6.
Nanometer polyhedral cage-type silsesquioxane (POSS) is added in traditional Teflom Insulation Material, its technical basis is: POSS is nonpolar cage-shaped nano structure, size is about 5.3nm, fusing point is greater than 400 DEG C, dielectric constant is between 2.1 ~ 2.7, there is the hole of 0.3 ~ 0.4nm, it is a kind of low-density, heat resistance is good, the meso-porous nano material of mechanical property and dielectric property excellence, there is small-size effect specific to nano material, the skin effect that bigger serface brings, quantum size effect, characteristic such as macroscopic view tunnel effect and Dielectric confinement effect etc.
POSS has unique nanostructure and the characteristic of organic inorganic hybridization, by POSS being incorporated in PTFE matrix, energy and PTFE carry out good fusion, improve the mechanical performance of material, croop property, anti-wear performance and dielectric property etc., especially Dielectric confinement effect makes POSS nano particle produce strong self poling inductive effect with the PTFE out-phase medium place contacted, make the radial localization of the electron cloud at out-phase medium place, limit the polarization of its electron cloud, thus make the dielectric constant of material be able to significant reduction.
Because POSS has the structure of rigidity and higher fusing point, heat resistance and the processing characteristics of material can also be improved, be conducive in the formation of pushing micropore in drawing process, the dielectric constant of further reduction insulating barrier and dielectric loss, thus improve the development and apply of composite material at high-temperature insulation cable, improve the HF communication performance of coaxial cable.
Table 1 polytetrafluoroethylmaterial material character and specificity analysis
As can be seen from the above table, it is high that polytetrafluoroethylene is that one has chemical stability, resistance to elevated temperatures is good, and the one insulating material of good performance had compared with low-k and dielectric loss, but its weak point to be coefficient of linear expansion comparatively large, mechanical performance is poor, melt viscosity is high, poor thermal conductivity, creep resistant is poor and expensive, processing difficulties etc.Nanometer polyhedral cage-type silsesquioxane (POSS) is nonpolar cage-shaped nano structure, average-size is about 5.3nm, fusing point is greater than 400 DEG C, dielectric constant is between 2.1 ~ 2.7, rigidity cube makes it have the cavity of 0.3 ~ 0.4nm, has low-density, excellent heat resistance and mechanical property simultaneously.Based on the nanostructure of POSS uniqueness and the characteristic of organic inorganic hybridization, by POSS being incorporated in PTFE matrix, energy and PTFE carry out good fusion, improve the mechanical performance of material, croop property, anti-wear performance and dielectric property etc., and heat resistance and the processing characteristics of material can also be improved, be conducive in the formation of pushing micropore in drawing process, and then improve the development and apply of composite material at high-temperature insulation cable.
Nanometer polyhedral cage-type silsesquioxane (POSS) material has good plasticity and toughness, intensity and hardness ratio common material height are a lot, because the size of nano particle is little, specific area is large, with polymer interface area and interact large, can good interfacial adhesion be obtained, the thermal expansion coefficient difference between composite material can be eliminated.The interpolation of a certain proportion of nanometer polyhedral cage-type silsesquioxane (POSS), improves hot strength and the elongation at break of PTFE material, improves the abrasion resistance of PTFE material.
Nano particle has the phenomenon of easily reuniting due to the nanoaction of its inherence, therefore we will before combination to nanometer polyhedral cage-type silsesquioxane (POSS) adopt silane coupler as: KH-550, KH-560, KH-570 or other suitable coupling agent etc. carry out surface modification treatment to improve nanoparticle dispersion, to ensure the full and uniform mixing of amorphous silica micro mist and polytetrafluoroethylmaterial material.The main purpose of surface modification is: the surface chemistry composition, Structure and morphology, the surface energy that change nano particle POSS, eliminate surperficial weak boundary layer, improve compatibility, wettability, the reactivity of nano material and PTFE surface property, formation fully can show the boundary layer of composite material composite effect, thus improves the decentralization of nano particle in PTFE.In addition the nucleation of crystal in the performance of nanometer specific performance in composite material and the course of processing, growth and heat treatment process can also be had influence on to the surface modification treatment of POSS.
The invention has the beneficial effects as follows:
The insulating barrier of high temperature resistant low-loss compound inslation coaxial cable of the present invention is nano composite material, inside has and is uniformly distributed and the consistent microcellular structure of hole, and the nano particle inherence being evenly distributed on material internal has nanoscale cavity, the cage modle effect of POSS is equivalent to introduce " nano bubble " or air-gap, compound material insulation layer has higher porosity, reduce the density of material, bring the decline of insulating material dielectric constant and dielectric loss tangent, substantially increase the HF communication performance of this cable.And the formation of microcellular structure mainly has benefited from the factor of the following aspects, first is the air-gap pushing the limited dimensions formed in process in mixing; Second be in stretching sintering process POSS fill PTFE composite material fusion-crystallization, molecule segment motion and orientation, form three-dimensional netted microcellular structure; 3rd is that the coupling agent coating film being attached to nano particle POSS surface at high temperature volatilizees decomposition in a large number, produces the organic bubble of a large amount of Small molecular, is full of and forms microcellular structure in a insulating layer.Meanwhile; POSS molecule has the features such as low-density, low atomic number, symmetrical structure, molecular polarizability be low; also there is higher mechanical strength and thermal stability; the introducing of POSS nano particle can also improve rigidity, the case hardness of polytetrafluoroethylene usually; improve heat-resisting and fire resistance, improve the comprehensive serviceability of cable insulation further.
High frequency most widely used at present steady phase high temperature-resistant cable teflon insulation layer mostly adopts microporous membrane multilayer wrapped or overall micropore stretching production technology.In around-packing technology, microporous membrane band cost is higher, when the wrapped number of plies is more, the uniform external diameter of insulation and appearance planarization is more difficult controls well, the sealing property that gap have impact on insulating barrier is there is in addition between wrapped rear film, in production operation process, also become easily infected by the impurity such as the micronic dust in air, and then affect voltage standing wave ratio and the dielectric loss of cable.Overall micropore drawing process does not still grasp associated fabrication techniques at present at home, and its technology difficulty is large, and equipment requirement is high, and produce product porosity and pore size control difficulty, and production process cost is high, conforming product rate is low, causes its application limited.Compared to above-mentioned two kinds of methods, high temperature resistant low-loss compound inslation coaxial cable production technology of the present invention is relatively simple, silane coupler first nano material is adopted to carry out surface treatment, the method of mechanical mixture and air-flow crushing is adopted fully to mix with PTFE subsequently, through colding pressing in advance, push stretching, sinter molding, cooling obtains nano combined microporous insulation layer.Production process is simple, stable processing technique, the filling-modified composite organic-inorganic material of nano material POSS improves the processing characteristics of polytetrafluoroethylene, more be conducive to pushing in drawing process in insulation forming microcellular structure, porosity is 50% ~ 80%, production difficulty and cost then decline greatly, and production efficiency is improved, and properties of product are also improved.Compared to traditional solid-core polyfluortetraethyleinsulating insulating cable, its high frequency serviceability, resistance to elevated temperatures and other electric properties are greatly improved.In addition, nano combined microporous insulation material cable also has good bending property, toughen and intensify, anti-attrition, and density is little, and bending radius is little, is easy to the advantages such as mounting and installation.
Be mainly reflected in the following aspects:
1) high temperature resistant low-loss compound inslation coaxial cable of the present invention reduces the dielectric constant of cable insulation.Be reduced to 1.2 ~ 1.6 by traditional solid teflon insulation dielectric constant 2.1, have dropped about 24% ~ 43%, reduce the signal attenuation of cable HF communication.
2) high temperature resistant low-loss compound inslation coaxial cable of the present invention improves the porosity of cable insulation.Inherence has the introducing of the cage modle nano particle POSS in nanoscale cavity, be equivalent to introduce " nano bubble ", the density of material is also reduced while increasing air-gap, and produce microcellular structure by pushing stretching sintering process, compared to solid-core polyfluortetraethyleinsulating insulating, voidage is promoted to 50% ~ 80%, and insulation weight reduces 52% ~ 78%, improves the bending property of cable and lays performance.
3) high temperature resistant low-loss compound inslation coaxial cable of the present invention simplifies technology difficulty, improves production efficiency.Nano level POSS and polytetrafluoroethylmaterial material is adopted fully to mix, because the fusing point of POSS is far above the melt temperature of polytetrafluoroethylene, so the existence of nano particle can reduce the polytetrafluoroethylene viscosity resistance under molten condition in the course of processing, improve the mobility between polytetrafluoroethylene molecule, be beneficial to compound inslation and push speed; And the interpolation of nano particle plays a part heterogeneous nucleation in the course of processing, the crystalline rate of polymer can be improved, more be conducive to pushing in drawing process and form micron order cavernous structure; Compared to other processing methods, simplify technology difficulty, improve production efficiency, also assures that the stability of whole cable quality, reduce die apparatus otherness to the impact of producing.
4) high temperature resistant low-loss compound inslation coaxial cable of the present invention improves conforming product rate, adds the combination property of cable.Adopt the filling-modified method of physical blending, operation is simple, technological parameter is stablized, compared to integrally stretching micropore and microporous membrane wrapped, conforming product rate greatly promotes, and due to nano material characteristics such as skin effect, quantum size effect, macroscopical tunnel effect and Dielectric confinement effects that the small-size effect of nanometer POSS material, bigger serface bring, make composite insulating material have excellent electric property, thermal stability, mechanical performance, mar proof and excellent machinability, improve the combination property of cable.
The ptfe composite that high temperature resistant low-loss compound inslation coaxial cable of the present invention adopts nanoporous cage-type silsesquioxane (POSS) filling-modified is as insulating barrier, improve the porosity of cable insulation, reduce the dielectric constant of cable insulation, add heat resistance and the mechanical performance of insulating barrier, simplify technology difficulty, improve production efficiency, improve conforming product rate, add the combination property of cable.By introducing nano-particles filled modification, improve material property, improve processing technology difficulty, microcellular structure is formed by pushing stretching sintering process, greatly improve cable electrical performance, for the application of Teflom Insulation Material on high temperature resistant low loss cable provides new thinking, also make the application prospect of product in HF communication more wide.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of high temperature resistant low-loss compound inslation coaxial cable of the present invention.
Fig. 2 is the side structure schematic diagram of high temperature resistant low-loss compound inslation coaxial cable of the present invention.
Fig. 3 is the POSS molecular structure that the present invention adopts.
Embodiment:
Below in conjunction with accompanying drawing, the invention will be further described:
Specific embodiment is optimized below in conjunction with one; example illustrates and helps to understand the present invention further; but embodiment detail is only in order to the present invention is described; do not represent the present invention and conceive lower whole technical scheme; therefore should not be construed as limited overall technical solution, In the view of some technical staff, the unsubstantiality not departing from the present invention's design is changed; such as simply change with the technical characteristic with same or similar technique effect or replace, all belonging to scope.
As shown in Figure 1, Figure 2, a kind of high temperature resistant low-loss compound inslation coaxial cable, be followed successively by from inside to outside: along the restrictive coating 4 of the solid or stranded metallic inner conductor 1 of the central axis longitudinal extension of cable, polytetrafluoroethylene micropore composite insulation layer 2, outer conductor 3 that is metal knitted or additional internal shield, fluorinated ethylene propylene copolymer or low smoke halogen-free flame-retardant polyolefin material, wherein metallic inner conductor 1 and outer conductor 3 separate by polytetrafluoroethylene micropore composite insulation layer 2; The material of described polytetrafluoroethylene micropore composite insulation layer 2 is the filling-modified polytetrafluoroethylene organic-inorganic nanocomposite of nanometer polyhedral cage-type silsesquioxane POSS.
As Fig. 3, it is characterized in that described polytetrafluoroethylene micropore composite insulation layer 2 is the polytetrafluoroethylene micropore composite insulating material containing nanometer polyhedral cage-type silsesquioxane (POSS).It is 0.53nm that this nano particle POSS cage structure is of a size of particle diameter, hole 0.3 ~ 0.4nm, and its dielectric constant is 2.1 ~ 2.7, needs to use silane coupler to process its surface before carrying out physical blending with polytetrafluorethylepowder powder, removes its surface polarity.The method of mechanical mixture and air-flow crushing that what this composite material adopted is combines and carries out mixing.In this nano-composite insulating material, the ratio of nano particle POSS is 5% ~ 25%, and the content of polytetrafluoroethylene is 75% ~ 95%.Micropore gap in described composite insulation layer is between 50% ~ 80%, and realizing composite insulation layer dielectric constant is between 1.2 ~ 1.6.
The material of metallic inner conductor 1 can be solid metallic conductor, as: bare copper wire, tinned wird, silver-coated copper wire, copper covered steel wire, silver-copper plated steel clad wire, soft beryllium copper line, silver-colored envelope curve etc.; Also can be stranded wire inner wire, material behavior: meet GJB 1640 or GB/T 3956 respective standard;
The material of polytetrafluoroethylene micropore composite insulation layer 2 is the materials such as nanometer polyhedral cage-type silsesquioxane POSS, polytetrafluoroethylene;
The material of outer conductor 3 is, braided metal line, and its material is identical with inner wire solid material, also can select galvanized steel wire, or adds internal shield metal copper strips or silver-plated copper strips etc.;
The material of restrictive coating 4 is the materials such as fluorinated ethylene propylene copolymer.
The material composition of nano-composite insulating layer 2 is most important to the structure of this kind of high temperature resistant telecommunication cable.Can require according to cable core structure, environment for use and communication performance can group modified to nano particle in insulating material, and the mixed proportion of nano particle and polytetrafluoroethylene and voidage carry out design modifying.
Embodiment recited above is only be described the preferred embodiment of the present invention; not the spirit and scope of the present invention are limited; do not departing under design concept prerequisite of the present invention; the various modification that in this area, common engineers and technicians make technical scheme of the present invention and improvement; all should fall into protection scope of the present invention, the technology contents of request protection of the present invention is all recorded in detail in the claims.
Claims (8)
1. a high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that being followed successively by from inside to outside: along the restrictive coating (4) of the solid or stranded metallic inner conductor (1) of the central axis longitudinal extension of cable, polytetrafluoroethylene micropore composite insulation layer (2), outer conductor (3) that is metal knitted or additional internal shield, fluorinated ethylene propylene copolymer or low smoke halogen-free flame-retardant polyolefin material, wherein metallic inner conductor (1) and outer conductor (3) separate by polytetrafluoroethylene micropore composite insulation layer (2); The material of described polytetrafluoroethylene micropore composite insulation layer (2) is the filling-modified polytetrafluoroethylene organic-inorganic nanocomposite of nanometer polyhedral cage-type silsesquioxane (POSS).
2. one according to claim 1 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that the material of described polytetrafluoroethylene micropore composite insulation layer (2) is the filling-modified polytetrafluoroethylene organic-inorganic nanocomposite of nanometer polyhedral cage-type silsesquioxane (POSS), in composition, nanometer polyhedral cage-type silsesquioxane (POSS) is polyhedron cagelike structure, the surrounding of its cube of Si-O-Si cagelike structure is connected to 8 organic groups (functional or inertia) in the mode of covalent bond, as hydrogen (hydride), alkyl (alkyl), alkylidene (alkylene), aryl (aryl), arlydene (arylene) and other deriveding groups (other derivative groups), for inorganic-organic hybridization nano particle, have the odd number solution of nano material, and there is good compatibility with organic polymer material.
3. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that in the material composition of described polytetrafluoroethylene micropore composite insulation layer (2), the size of nanometer polyhedral cage-type silsesquioxane (POSS) cage is about 0.53nm, it is a kind of Intrinsical porous media material, in molecular structure, space is about 0.3-0.4nm, dielectric constant is 2.1 ~ 2.7, adjustable.
4. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that in the material composition of described polytetrafluoroethylene micropore composite insulation layer (2), before filling-modified, adopt silane coupler or other suitable coupling agents to process nanometer polyhedral cage-type silsesquioxane (POSS), coupling agent can strengthen the interaction between two kinds of opposed polarity molecules, serve as a kind of effect of chemical medium, increase the intensity of composite material, improve adhesion between the two, ensure that it mixes with the full and uniform of polytetrafluoroethylmaterial material.
5. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that in the material composition of described polytetrafluoroethylene micropore composite insulation layer (2), the ratio of filling-modified nanometer polyhedral cage-type silsesquioxane (POSS) is 5% ~ 25%, and the content of polytetrafluoroethylene is 75% ~ 90%.
6. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, is characterized in that the physical blending of the material of described polytetrafluoroethylene micropore composite insulation layer (2) is combined by two kinds in employing mechanical mixture, air-flow crushing and ultrasonic wave process and above method fully to mix.
7. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that described polytetrafluoroethylene micropore composite insulation layer (2) is by pushing stretching mode processing, ensure that insulating barrier has certain uniform pore, form micropore shape composite construction.
8. one according to claim 2 high temperature resistant low-loss compound inslation coaxial cable, it is characterized in that the porosity of the micropore in described polytetrafluoroethylene micropore composite insulation layer (2) is between 50% ~ 80%, the micropore composite insulation layer dielectric constant realizing nanometer polyhedral cage-type silsesquioxane (POSS) filling-modified is 1.2 ~ 1.6.
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Application publication date: 20150128 |